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[flyrotary.com,lancaironline.net] WEIRD_PORT 0.001 Uses non-standard port number for HTTP --000000000000e5cba3062b66f374 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable They do crack in the car, regardless. On Fri, Jan 10, 2025 at 10:36=E2=80=AFPM Stephen Izett stephen.izett@gmail.= com < flyrotary@lancaironline.net> wrote: > Hi there Dave > > I understood the torque converter was driven from the flex plate. > Can someone confirm how power is transferred from the Eccentric to the > torque converter? > > Steve Izett > > On 11 Jan 2025, at 9:35=E2=80=AFam, David Leonard wdleonard@gmail.com < > flyrotary@lancaironline.net> wrote: > > in the car, the flex plates are only used to carry the torque from the > starter and are not designed to transmit the output of the engine. in our > setups. We have adapted this flex plate to transmit the entire output of > the engine which it apparently is not up to. > > I had my rd1-b seize up a bearing during a race at Reno which may have > been due to gyroscopic forces, but I think the flex plate issue just need= s > to be fixed by replacing all the flex plates with proper flywheels. > > Dave Leonard > > On Fri, Jan 10, 2025, 1:45=E2=80=AFAM Le Roux Breytenbach > breytenbachleroux@gmail.com wrote: > >> What i can rember was this also a topic on the late Paul L group >> discussion. >> Maybe Dave Leonard can chime in - think more that it was gyroscopic >> forces that craked the plates >> Maybe i can find the photos and topic in my old mails >> >> Sent from my iPhone >> Le Roux Breytenbach >> >> On 10 Jan 2025, at 08:13, Andrew Martin andrew@martinag.com.au < >> flyrotary@lancaironline.net> wrote: >> >> =EF=BB=BF >> Maybe some of the cracking flexplates are resulting from starting issues= , >> the starter motor can hammer the ring gear if not meshing correctly or i= f >> engine misfires on start. may explain why so many flexplates come >> pre-cracked from the wreckers. >> >> Andrew >> >> >> >> >> >> On Fri, 10 Jan 2025 at 11:32, Stephen Izett stephen.izett@gmail.com < >> flyrotary@lancaironline.net> wrote: >> >>> Hi M >>> >>> I was wondering the same thing. >>> >>> What I discovered first of all was that flex plates are designed to fle= x >>> (funny that) and cracking is not limited to our setup. >>> There are companies that specialise in stronger flex plates, >>> particularly for modified and higher horsepower engines. >>> >>> Since our engines are being used at a higher horsepower per unit time >>> and therefore higher stress (assumption) perhaps our setup could be lik= ened >>> to race applications. >>> But then our hours of use would be significantly lower (assumption) tha= n >>> an average vehicle, but perhaps not a race application. >>> Is the cracking we are seeing consistent with race applications? But >>> they dont race automatics, do they? >>> >>> So my take on this is that perhaps the flexing of the plate in our setu= p >>> is to some extent higher than OEM. >>> >>> Our options seem to be: >>> 1. Replacing the OEM flex plate with a stronger part. Steve B being the >>> latest going down that track and in his case also removing the rubber >>> isolation in the process. >>> 2. Connect direct to the eccentric shaft and therefore taking the stres= s >>> off the Flex Plate doing away with the damping mechanism which Tracy di= d, >>> and perhaps is still doing. Would be real nice to know. >>> >>> Like M, I would appreciate hearing what others know or are thinking or >>> doing. >>> >>> Steve Izett >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> > On 10 Jan 2025, at 2:15=E2=80=AFam, Marc Wiese cardmarc@charter.net < >>> flyrotary@lancaironline.net> wrote: >>> > >>> > Has the cause of these cracks been uncovered, and if so, what is the >>> current thinking on it? An AL racing plate? >>> > M >>> > Sent from my iPhone >>> > >>> >> On Jan 9, 2025, at 1:31=E2=80=AFAM, Steven W. Boese SBoese@uwyo.edu = < >>> flyrotary@lancaironline.net> wrote: >>> >> >>> >> =EF=BB=BFSteve, >>> >> >>> >> I didn=E2=80=99t see the cracks prior to disassembly and doubt that = they >>> could have been seen on the counterweight side very well -if at all- wh= en >>> assembled. >>> >> >>> >> I replaced the Flexplate with a steel flywheel about a year ago. >>> Since then, I replaced the four rubber dampers with machined aluminum d= iscs >>> giving a solid connection and then dynamically balanced the system. Th= is >>> was done because maintaining a dynamic balance wasn=E2=80=99t possible = with the >>> dampers. Only a few hours of flight have occurred in this configuratio= n so >>> far and there has been no indication of problems resulting from this ch= ange. >>> >> >>> >> Steve Boese >>> >> >>> >>> On Jan 8, 2025, at 11:03=E2=80=AFPM, Stephen Izett stephen.izett@gm= ail.com < >>> flyrotary@lancaironline.net> wrote: >>> >>> >>> >>> =EF=BB=BF=E2=97=86 This message was sent from a non-UWYO address. P= lease exercise >>> caution when clicking links or opening attachments from external source= s. >>> >>> >>> >>> >>> >>> Hi Steve >>> >>> >>> >>> Is this recent then? >>> >>> >>> >>> I=E2=80=99m not able to get to my aircraft at present to check my f= lex plate >>> which has probably seen 50 hours of service. >>> >>> >>> >>> Was it possible to see these cracks assembled? >>> >>> >>> >>> I would appreciate your reflections on Tracys latter choice to >>> remove the damper, and particularly when using a timber/glass prop such= as >>> an MT. >>> >>> >>> >>> It would be great to have an update and current info from Tracy >>> regarding his no damper hours if anyone can contact him. >>> >>> >>> >>> Very helpful, thanks again Steve >>> >>> >>> >>> Steve >>> >> >>> >> -- >>> >> Homepage: http://www.flyrotary.com/ >>> >> Archive and UnSub: >>> http://mail.lancaironline.net:81/lists/flyrotary/List.html >>> > >>> > >>> > >>> > -- >>> > Homepage: http://www.flyrotary.com/ >>> > Archive and UnSub: >>> http://mail.lancaironline.net:81/lists/flyrotary/List.html >>> >>> >>> >>> -- >>> Homepage: http://www.flyrotary.com/ >>> Archive and UnSub: >>> http://mail.lancaironline.net:81/lists/flyrotary/List.html >>> >> > --000000000000e5cba3062b66f374 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
The= y do crack in the car, regardless.

On Fri, Jan 1= 0, 2025 at 10:36=E2=80=AFPM Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
Hi there Dave

<= div>I understood the torque converter was driven from the flex plate.=C2=A0=
Can someone confirm how power is transferred from the Eccentric = to the torque converter?

Steve Izett

On 11 Jan 2025, at 9:35=E2=80=AFam, David Leonard wdleonard@gmail.com <= flyrotary@= lancaironline.net> wrote:

in the car= , the flex plates are only used to carry the torque from the starter and ar= e not designed to transmit the output of the engine. in our setups. We have= adapted this flex plate to transmit the entire output of the engine which = it apparently is not up to.=C2=A0

I had my rd1-b seize up a bearing during a race at Reno which may have = been due to gyroscopic forces, but I think the flex plate issue just needs = to be fixed by replacing all the flex plates with proper flywheels.=C2=A0

Dave Leonard=C2=A0
<= /div>
O= n Fri, Jan 10, 2025, 1:45=E2=80=AFAM Le Roux Breytenbach breytenbachleroux@gmail.com<= /a> <fl= yrotary@lancaironline.net> wrote:
What i can rember was this also = a topic on the late Paul L group discussion.
Maybe Dave Leonard can chi= me in - think more that it was gyroscopic forces that craked the plates
Maybe i can find the photos and topic in my old mails

Sent from my iPhone
Le Roux Breytenbach=C2=A0

On 10 Jan 2025, at = 08:13, Andrew Martin andrew@martinag.com.au <flyrotary@= lancaironline.net> wrote:

=EF=BB=BF
Maybe some of the= cracking flexplates are resulting from starting issues, the starter motor = can hammer the ring gear if not meshing correctly or if engine misfires on = start. may explain why so many flexplates come pre-cracked from the wrecker= s.

Andrew





On Fri, 10 Jan 2025 at 11:32, Stephen Izett st= ephen.izett@gmail.com <flyrotary@lancaironline.net> = wrote:
Hi M

I was wondering the same thing.

What I discovered first of all was that flex plates are designed to flex (f= unny that) and cracking is not limited to our setup.
There are companies that specialise in stronger flex plates, particularly f= or modified and higher horsepower engines.

Since our engines are being used at a higher horsepower per unit time and t= herefore higher stress (assumption) perhaps our setup could be likened to r= ace applications.
But then our hours of use would be significantly lower (assumption) than an= average vehicle, but perhaps not a race application.
Is the cracking we are seeing consistent with race applications? But they d= ont race automatics, do they?

So my take on this is that perhaps the flexing of the plate in our setup is= to some extent higher than OEM.

Our options seem to be:
1. Replacing the OEM flex plate with a stronger part. Steve B being the lat= est going down that track and in his case also removing the rubber isolatio= n in the process.
2. Connect direct to the eccentric shaft and therefore taking the stress of= f the Flex Plate doing away with the damping mechanism which Tracy did, and= perhaps is still doing. Would be real nice to know.

Like M, I would appreciate hearing what others know or are thinking or doin= g.

Steve Izett












> On 10 Jan 2025, at 2:15=E2=80=AFam, Marc Wiese cardmarc@charter.net<= /a> <flyrotary@lancaironline.net> wrote:
>
> Has the cause of these cracks been uncovered, and if so, what is the c= urrent thinking on it? An AL racing plate?
> M
> Sent from my iPhone
>
>> On Jan 9, 2025, at 1:31=E2=80=AFAM, Steven W. Boese SBoese@uwyo.edu <flyrotary@lancaironline.net> wrote:
>>
>> =EF=BB=BFSteve,
>>
>> I didn=E2=80=99t see the cracks prior to disassembly and doubt tha= t they could have been seen on the counterweight side very well -if at all-= when assembled.
>>
>> I replaced the Flexplate with a steel flywheel about a year ago.= =C2=A0 Since then, I replaced the four rubber dampers with machined aluminu= m discs giving a solid connection and then dynamically balanced the system.= =C2=A0 This was done because maintaining a dynamic balance wasn=E2=80=99t p= ossible with the dampers.=C2=A0 Only a few hours of flight have occurred in= this configuration so far and there has been no indication of problems res= ulting from this change.
>>
>> Steve Boese
>>
>>> On Jan 8, 2025, at 11:03=E2=80=AFPM, Stephen Izett stephe= n.izett@gmail.com <flyrotary@lancaironline.net> wrot= e:
>>>
>>> =EF=BB=BF=E2=97=86 This message was sent from a non-UWYO addre= ss. Please exercise caution when clicking links or opening attachments from= external sources.
>>>
>>>
>>> Hi Steve
>>>
>>> Is this recent then?
>>>
>>> I=E2=80=99m not able to get to my aircraft at present to check= my flex plate which has probably seen 50 hours of service.
>>>
>>> Was it possible to see these cracks assembled?
>>>
>>> I would appreciate your reflections on Tracys latter choice to= remove the damper, and particularly when using a timber/glass prop such as= an MT.
>>>
>>> It would be great to have an update and current info from Trac= y regarding his no damper hours if anyone can contact him.
>>>
>>> Very helpful, thanks again Steve
>>>
>>> Steve
>>
>> --
>> Homepage:=C2=A0 http://www.flyrotary.com/
>> Archive and UnSub:=C2=A0 =C2=A0http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>
>
> --
> Homepage:=C2=A0 http://www.flyrotary.com/
> Archive and UnSub:=C2=A0 =C2=A0http://mail.lancaironline.net:81/lists/flyrotary/List.html



--
Homepage:=C2=A0 http://www.flyrotary.com/
Archive and UnSub:=C2=A0 =C2=A0= http://mail.lancaironline.net:81/lists/flyrotary/List.html

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